Improvement in saw-mills



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illlllllllIlIlIll|lIIIHIIIIllllllllllllllllllllllll W. S. GUL'WELL. Saw-Mills.

3 Sheets--Sheet 2.

Patented Dec. 17,1872.

3 sheets--sheetm W. S.'COLWELL. Saw-Mills.

Patented Dec.. 17,1872.

STATES PATENT @Prion wrLLIAM s. coLwnLL, or rirfrsBURe, PENNSYLVANIA.

IMPROVEMENT IN SAW-MILLS.

To all whom it may concern:

l Beit known that I,W1LLIAM S. CoLwELL, ,of Pittsburg; in the. county of Allegheny and ,Stateof Pennsylvania, have invented a new and useful Improvement in Saw-Mills, and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing and Ito the letters of reference marked thereon.

i The nature of my invention consists in constructing the hangings of muley saws so that "the several part-s may be adjustedto give the ,saw any desired rake and cause it to cut uniformly in passing throughl the log or other timber, and compensate for the diiference in the travel of its pitman and the crank to which `it is attached. y

To enable others skilled in the art to make andnnse my invention, I will proceedto de- .s'cribe its construction and operation.

-QIn the accompanying drawing which forms part of myspecication, Figure 1 is a front elevation of .my improvement in hangings for muley saws, and represents them connected with the saw-frame work and drivingigear; Fig. 2 isa back view of the upper hangings, representing.l the extreme upper part broken away; Fig. 3 is a vertical section of the same vcut through at line yI in Fig. 2; Fig. 4 is a y front view of a section of the saw, its pitman,

and slides4 for the same, and also represents a front view of the several parts used for the purpose of attachin gthe lower end of the saw to the pitman; Fig. 5 is a side view ofthe same; Fig. 6 is an end view of the pitman, its slides, `and 'the parts connected with it for pivoting the saw to the pitman; Fig. 7 is a transverse section of the lower hangings at line ya in Fig. 1,

showing an end view of the slides, guides, and

Vpitman; Fig. Sis a top viewof the cross-head to which the upper end of the saw is attached; Fig. 9. is a side view of the same; Fig. 10 is a front view of the same, showing it in position with'relation to its slides; Fig. 11 is a transverse section of the upper hangings at line y2 in Fig. 2; Fig. 12 is a side view of the adjust ablengerholders and Fig. 13 is a diagram illustrating the difference in the travel of the pitman-crank with relation to the vertical and horizontal planes of its axis.

In the accompanying drawing, A represents the frame toV which the hangings for the muleysawareattached.;4 .B representsthepitman,

\ the lower end of which is attached to thewrist- Spcification :forming part of Letters Patent No. 133,922, dated December 17, 1872 antedated November pin x2 of lthe crank-wheel G, which receives its `motion through the medium of the drivingpulley D. To the upper end of the pitman B is secured a forked end, l, between the arms x4 of which are placed two plates marked 4, which are united or connected at the lower end with the stirrup wrist-pin m. These pieces 4 are provided with tongues x5, (shown in Figs. 6 and 7,) which move in grooves on the inner side of x4, into which iit the corrugations of a a washer, 3. Through the arms m4, pieces 4, and washer 3 pass the ends of the pivots marked 5,the inner ends of which are provided with screw-threads, on which are fitted screwnuts 2. The arms x4 and pieces 4 are provided with slots, which will allow the position of the pivots 5 to be changed with relation to the vstirrup wrist-pin m. The changing of the position of the pivots 5 is effected by unscrewing the nuts 2 and moving the pivots 5 and washers 3 up or down, as may be desired, and then securing them in a fixed position by screwing up the nuts 2. By this arrangement for the changing the position of the pivot-s 5 with relation to the stirrup wrist-pin. m', the lower end of the saw A' can be adjusted with relation to the rake given to it, and compensate for the difference in the forward travel of the saw in the operation of sawing, (the difference of the forward travel of the saw being due to the difference in the travel of the pitman-crank with relation to the vertical and horizontal planes of its aXis,) whereby it will cut uniformly in passing through the log or other timber in the operation of sawing. The slides o are pivoted, about midway between their center and upper end, to the frame marked m. On the back of the frame m, between two lugs, x, is pivoted a screw-nut, w, through which passes a screw, V, the inner end of which is pivoted to the cross-bar l', which connects together the lower ends of the slides o, their upper ends being connected by a cross-piece marked l. On the outer end of the screw V is a small hand-wheel, u. This screw is used in connection with the pivots of the slides for giving to Athem the proper incline, whereby the desired rake of the saw A is obtained. The nut w is pivoted between the lugs a: to allow it to assume the desired angle with relation to the inclination of the slidesduring the operation of changing their an gle of inclination, thus allowing the screw V to move in the nut w freely, without any-cramped action. The crosshead i' for the upper end of the saw, is constructed ot' parts f1 and g', which are held together by means ot' bolts s', which pass through slotted openings, the part g being provided with an incline, which moves upon an incline on the part f1. The inclines and slots of the cross-head r are indicated at 6 in Fig. 10. The slides o are itted to the recesses e2. By constructing the cross-head r in sections, as shown by f1 and g, and providing these sections with inclinations and slots, and holding the parts together by bolts s', the cross-head may be expanded outward, so as to compensate for the wear of the crosshead r and slides o. On the fra-me m, to which the slides o are pivoted, are arranged slidebars n for the ngers la. These slide-bars are provided with racks s, which, in connection with the pinions t on the shaft r', are used for the purpose of raising or lowering the slidebar by turning the hand-wheel p. To the lower end of the slide-bars n, (held in position with relation to each other and the frame m by the transverse cross-piece B,) are attach ed pieces h provided with grooves in which are placed adjustable pieces i, and in which pieces t' are placed the fingers k, the pieces t' and the fingers la being held in position with relation to the groove-pieces h by mea-ns of setscrews j. The construction of the groovepieces h, the adjustable pieces t', the fingers k, and set-screwj,v and their arrangement with relation to each other and the mode of operating and adjusting the parts to each other and to the saw, will readily be understood by the skillful mechanic by reference to Figs. l and l2. On the pivots 5 ofthe pitman B are placed slide-blocks e, which move between slides f secured to the side-plates e, the upper and lower ends of which are stayed by means of transverse pieces C. .'Ihe slides f are held in position with relation to the side plates e by means of set-screws f2, which are placed in slots in the slides f, so that they may be adjusted upon the side plates e in the operation of lining up the saw-hangings through the medium of set-screws g. Between the slideblocks el and the plates e are placed plates 8, which are adjusted with relation to the slideblocks el through the medium of set-screws w3. By this arrangement ot' the plates 8 and the set-screws w3 a steady movement of the upper end of the pitman and a true vertical movement of the saw may be secured, and compensation obtained for the wear of the slide-blocks. To the upper end ofthe side plates e are a-ttached a set of groove-pieces, h, for the adjustable pieces-t" and fingers k, hereinbefore described. The fingers k can be adjusted to saws of different widths, and are used to prevent the buckling of the saw. The difference in the travel of the pitman-crank with relation to the vertical and horizontal planes of its axis is clearly illustrated in the diagram shown in Fig. 13, in which line 9 represents the vertical plane of the axis of the crank or crank-wheel, and line 10 represents the horizontal plane of its axis. Now, if the circuit in which the wrist-pin travels is divided into eight equal arcs, and the wrist of the crank on line 9, as indicated at the point marked l1, moves forward to the point marked 12, the travel of the wrist-pin on a horizontal plane will be greater than it will be in moving from the point marked l2 to the point marked 13. This difference in the travel of the wristpin with relation to the horizontal plane ofthe axis of the crank causes a difference in the cutting of the saw. To compensate for this diierence I pivot the slides o for the crosshead Vr about midway between their center and Y upper end, and range the pivot-points 5 in the upper end of the pitman B, andthe wrist-pin for the stirrup of the saw with relation to the said pivot-points ofthe pitman, as hereinbefore described, whereby I can give the saw any desired rake, and adj ust its point of pivot in relation to the pivot-points of the pit'man B so that the saw will cut uniformly in its passage through the log or other timber, and at the same time compensate fully for the difference in travel of the wrist-pin of the crank with relation to the horizontal plane of its axis. The saw is attached to its wrist-pin m of the pitman B, and to the wrist-pin of the crosshead r, by means of stirrups J and J', and brasses u, all of which are of ordinary construction, and are secured to the ends of the saw in the ordinary manner.

When the several parts hereinbefore'v described are arranged with relation to theupper end of the pitman B and the saw as represented in the accompanying drawing, and the crank revolves in the direction of the cut of the saw, it is called a front-door muley saw, but it' the position of the pivot-points 5 and the stirrup wrist-pin m be reversed in the forked end lof the pitman B, the saw may .be converted into what is called a back-door mu- Having thus described the construction, arrangement, and operation of the several parts of my improvement in muley-saw hangings, what I claim as being of my invention is- 1. The cross-head i', consisting of pieces f1 and g', and bolts s', constructed, arranged, and operating with relation to each other substantially as herein described, and for the purpose set forth.

2. The pieces 4, washers 3, nuts 2, pivots 5,

vwrist-pin m', and forked end l, constructed as herein described, and for the purpose set forth.

3. The combination of the pivot-points 5, slide-blocks e', plates 8, set-screws w3 and g, and adjustable guides or slides f and o, constructed, arranged, and operating with rela'- tion to each other as herein described, and for the purpose set forth.

W. S. UOLWELL. Witnesses:

A. C. JOHNSTON, JAMES J. JOHNSTON. 

